From: Colin Ian King colin.king@canonical.com
[ Upstream commit 9baa3d64e8e2373ddd11c346439e5dfccb2cbb0d ]
There a 3 array for-loops that don't check the upper bounds of the index into arrays and this may lead to potential out-of-bounds reads. Fix this by adding array size upper bounds checks to be full safe.
Addresses-Coverity: ("Out-of-bounds read")
Link: https://lore.kernel.org/linux-media/20201007121628.20676-1-colin.king@canoni... Fixes: 333829110f1d ("[media] m88rs6000t: add new dvb-s/s2 tuner for integrated chip M88RS6000") Signed-off-by: Colin Ian King colin.king@canonical.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/tuners/m88rs6000t.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/media/tuners/m88rs6000t.c b/drivers/media/tuners/m88rs6000t.c index b3505f402476..8647c50b66e5 100644 --- a/drivers/media/tuners/m88rs6000t.c +++ b/drivers/media/tuners/m88rs6000t.c @@ -525,7 +525,7 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength) PGA2_cri = PGA2_GC >> 2; PGA2_crf = PGA2_GC & 0x03;
- for (i = 0; i <= RF_GC; i++) + for (i = 0; i <= RF_GC && i < ARRAY_SIZE(RFGS); i++) RFG += RFGS[i];
if (RF_GC == 0) @@ -537,12 +537,12 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength) if (RF_GC == 3) RFG += 100;
- for (i = 0; i <= IF_GC; i++) + for (i = 0; i <= IF_GC && i < ARRAY_SIZE(IFGS); i++) IFG += IFGS[i];
TIAG = TIA_GC * TIA_GS;
- for (i = 0; i <= BB_GC; i++) + for (i = 0; i <= BB_GC && i < ARRAY_SIZE(BBGS); i++) BBG += BBGS[i];
PGA2G = PGA2_cri * PGA2_cri_GS + PGA2_crf * PGA2_crf_GS;